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References:
[1] Гeдpлин 3., Гopaльчик П.: O cдвuгax noлyгpynn I, Пepuoдuчecкue u квaзunepuoдuчecкue npeoбpaзoвaнuя. Mat. časop. 18 (1968), 161-176.
[2] Clifford A. H., Preston G. B.: The algebraic theory of semigroups. vol. 1, Amer. Math. Soc, Providence 1961. MR 0132791 | Zbl 0111.03403
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